<template>
  <div class="search-container">
    <!-- 顶部搜索栏 -->
    <form class="search-form" action="/">
      <van-search
        v-model="searchText"
        show-action
        background="#3296fa"
        placeholder="请输入搜索关键词"
        @search="onSearch"
        @cancel="onCancel"
        @focus="isResultShow = false"
      />
    </form>

    <!-- 搜索结果 -->
    <SearchResult
      v-if="isResultShow"
      :search-text="searchText"
    />

    <!-- 联想建议 -->
    <SearchSuggestion
      v-else-if="searchText"
      :search-text="searchText"
      @search="onSearch"
      @update-search-histories="searchHistories = []"
    />

    <!-- 搜索历史记录 -->
    <SearchHistory
      v-else
      :search-histories="searchHistories = []"
      @search="onSearch"
    />

  </div>
</template>

<script>
import SearchHistory from './components/search-history.vue'
import SearchSuggestion from './components/search-suggestion.vue'
import SearchResult from './components/search-result.vue'
import { setItem, getItem } from '@/utils/storage'
export default {
  name: 'SearchIndex',
  components: {
    SearchHistory, SearchSuggestion, SearchResult
  },
  data () {
    return {
      searchText: '',
      isResultShow: false, // 控制搜索结果的展示
      searchHistories: getItem('TOUTIAO_SEARCH_HISTORIES') || [] // 搜索的历史记录
    }
  },
  watch: {
    searchHistories (value) {
      setItem('TOUTIAO_SEARCH_HISTORIES', value)
    }
  },
  methods: {
    onSearch (val) {
      // 更新文本框内容
      this.searchText = val
      // 存储搜索历史记录
      // 要求: 不要有历史记录 最新的排在最前面
      const index = this.searchHistories.indexOf(val)
      if (index !== -1) {
        this.searchHistories.splice(index, 1)
      }
      this.searchHistories.unshift(val)
      // 渲染搜索结果
      this.isResultShow = true
    },
    onCancel () {
      this.$router.back()
    }
  }
}
</script>

<style lang="less" scoped>
.search-container {
  padding-top: 108px;
  .van-search__action {
    color: #fff;
  }

  .search-form {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1;
  }
}
</style>
